<< >> NASA ASRS Report 590336, August 2003

E145 crew had a TCASII TA after the aircraft gained 400 ft when the autoplt disconnected in moderate turbulence, in a holding pattern.

Attributes
ACN	590336
Time
Date	200308
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : lizzi
State Reference	NJ
Altitude	msl bound lower : 11000 msl bound upper : 11400
Environment
Flight Conditions	IMC
Weather Elements	Rain Thunderstorm Turbulence Windshear
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	arrival : holding pattern arrival star : mip
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zny.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : multi engine
Experience	flight time last 90 days : 185 flight time total : 3650 flight time type : 1125
ASRS Report	590336
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 1800 flight time type : 300
ASRS Report	590974
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : weather inflight encounter : turbulence inflight encounter other non adherence : published procedure non adherence : far non adherence : company policies non adherence : required legal separation other anomaly
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : regained aircraft control flight crew : returned to assigned altitude flight crew : exited adverse environment other
Miss Distance	vertical : 600
Supplementary
Problem Areas	Aircraft Weather Flight Crew Human Performance
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

We were descending for arrival into lga, on the MIP3 arrival. Due to WX on the arrival just to the west of beuty intersection, we were given holding instructions at lizzi intersection. We held as published at 11000 ft MSL with 10 DME legs. After entering the hold, as we turned back on the inbound leg, we passed through some buildups and encountered moderate turbulence, windshear, and moderate precipitation and it lasted for 20 seconds. During the second turn inbound on the hold, we asked for 5 DME legs to try to bypass the buildups, but it didn't help. On the inbound turn of the hold, we encountered moderate turbulence again and this time we got the stick shaker, followed by loss of the autopilot. While gaining control of the airplane, we gained 400 ft of altitude for about 2 seconds. Someone was in the hold at 12000 ft and we received a TA, but no RA. After passing through the buildup/cell, we leveled off at 11000 ft again and re-engaged the autoplt. We advised center that we could not take any more turns in the hold and we continued on the arrival. After the first turn in the hold, we should not have continued holding at the same altitude on the same radial. We should have asked for a different holding fix or continued the arrival.

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Original NASA ASRS Text

Title: E145 CREW HAD A TCASII TA AFTER THE ACFT GAINED 400 FT WHEN THE AUTOPLT DISCONNECTED IN MODERATE TURB, IN A HOLDING PATTERN.

Narrative: WE WERE DSNDING FOR ARR INTO LGA, ON THE MIP3 ARR. DUE TO WX ON THE ARR JUST TO THE W OF BEUTY INTXN, WE WERE GIVEN HOLDING INSTRUCTIONS AT LIZZI INTXN. WE HELD AS PUBLISHED AT 11000 FT MSL WITH 10 DME LEGS. AFTER ENTERING THE HOLD, AS WE TURNED BACK ON THE INBOUND LEG, WE PASSED THROUGH SOME BUILDUPS AND ENCOUNTERED MODERATE TURB, WINDSHEAR, AND MODERATE PRECIPITATION AND IT LASTED FOR 20 SECONDS. DURING THE SECOND TURN INBOUND ON THE HOLD, WE ASKED FOR 5 DME LEGS TO TRY TO BYPASS THE BUILDUPS, BUT IT DIDN'T HELP. ON THE INBOUND TURN OF THE HOLD, WE ENCOUNTERED MODERATE TURB AGAIN AND THIS TIME WE GOT THE STICK SHAKER, FOLLOWED BY LOSS OF THE AUTOPILOT. WHILE GAINING CTL OF THE AIRPLANE, WE GAINED 400 FT OF ALT FOR ABOUT 2 SECONDS. SOMEONE WAS IN THE HOLD AT 12000 FT AND WE RECEIVED A TA, BUT NO RA. AFTER PASSING THROUGH THE BUILDUP/CELL, WE LEVELED OFF AT 11000 FT AGAIN AND RE-ENGAGED THE AUTOPLT. WE ADVISED CTR THAT WE COULD NOT TAKE ANY MORE TURNS IN THE HOLD AND WE CONTINUED ON THE ARR. AFTER THE FIRST TURN IN THE HOLD, WE SHOULD NOT HAVE CONTINUED HOLDING AT THE SAME ALT ON THE SAME RADIAL. WE SHOULD HAVE ASKED FOR A DIFFERENT HOLDING FIX OR CONTINUED THE ARR.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.